Mg (magnesium)
The element that would have properties most similar to the new element would be an element that lies in the same group as the new element. Specifically, the element with the most similar properties will lie directly above or below that element in the group.
Chlorine (Cl) would most likely have chemical properties similar to fluorine (F) since they are both halogens and belong to the same group on the periodic table, sharing similar reactivity and physical properties.
Based on the properties you described, the unknown element is likely a metal. Metals are typically shiny and good conductors of electricity. You could also predict that it is likely malleable and ductile, as these are common properties of metals.
Bart would likely have properties more similar to Twee, as both are metals with similar atomic structures and properties. Grom, on the other hand, is a non-metal that would have different properties compared to Twee.
No. The smallest particle of an element that has the properties of that element is an atom.
Someone would most likely receive a shock through the element of electricity.
The interplanetary, interstellar, and even intergalactic word for oxygen would still be "oxygen".
If an element were broken down into its smallest particles, you would get atoms of that element. Each atom is the smallest unit of an element that retains the properties of that element.
That would be the noble gases
Yes.
Silicon.
Ununoctium, element 118 on the periodic table, is a synthetic element and its properties are not well-studied. It is unlikely to emit visible light on its own because of its high radioactivity and short half-life. If it were to emit light, it would likely glow a bluish color due to its atomic properties.